You will need
• - tools for cutting wire;
• - table of specific resistances;
• - additional resistance.
Instruction
1
Identify the substance from which made the guide. Find the specific resistance using the table. Lower the resistance of the conductor having the same conductor, only of substances, the specific resistance is lower. How many times will smaller this value is the number of times decreases the resistance of the conductor.
2
If possible, reduce the length of the conduit, which is used in the circuit. Resistance is directly proportional to conductor length. If you shorten the conductor in the n times, then the resistance decreases by the same factor.
3
Increase the cross-sectional area of the conductor. Install conduit with a large cross-section or connect several conductors in parallel in the bundle of wires. How many times will increase the cross-sectional area of the conductor, as many times decreases the resistance of the conductor.
4
You can combine these methods. For example, to reduce the resistance of the conductor 16 times, replaced it with a conductor, specific resistance of less than 2 times reduce 2 times its length and cross-sectional area 4 times.
5
To reduce resistance on the part of the chain, attach it in parallel to another resistance, the value of which calculate. Note that when parallel connection, the resistance of circuit is always less than the smallest resistance in the parallel branches. Calculate the required resistancethat must be attached in parallel. To do this, measure the resistance of the circuit R1. Determine the resistance, which should it be – R. then, determine the resistance R2, which should be attached to the resistance R1 in parallel. To do this, find the product of the resistances R and R1 and divide by the difference between R1 and R (R2 = R • R1 / (R1 - R)). Note that condition R1 is always larger than R.